Opcode

Permits defining an operator mask so that any code containing a masked opcode will not compile or execute when Perl next compiles any code. Not usually used directly; for examples of Opcode's use, see the ops pragma and the Safe module.

Valid opcodes are listed in the array op_name in the file opcode.h. Many Opcode functions and methods take lists of operators, which are composed of elements. Each element can be a:

• name (opname) or negated name
• Name of operator, usually lowercase. Prefixing the name with an exclamation mark (!) removes it from the accumulated set of operations.
• set (opset)
• Operator set. Binary string holding a set of zero or more operators.
• tag name (optag) or negated tag
• Operator tag name; refers to groups (or sets) of operators. Begins with a colon (:). Negated by prefixing with an exclamation mark (!). Several optags are predefined, including the following. See the manpage for the Opcode module for the opcodes included in each tag.
  
  

  :base_core :base_io :base_loop :base_math :base_mem :base_orig :browse :dangerous :default :filesys_open :filesys_read :filesys_write :others :ownprocess :still_to_be_decided :subprocess :sys_db
  

  
  
  

Functions

All the following functions can be exported:

• define_optag
• empty_opset
• full_opset
• invert_opset
• opcodes
• opdesc
• opdump
• opmask
• opmask_add
• opset
• opset_to_hex
• opset_to_ops
• verify_opset